Self-Biased Circuit for Input-Output Voltage Stability
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Solution Overview
Problem
Conventional input and output circuits in integrated circuits lack effective mechanisms to stabilize voltage levels during system failures, potentially leading to collapse or significant electric leakage.
Innovation Solution
A self-biased circuit comprising a tracking circuit, biasing control circuit, and transistors that generate a bias voltage based on power voltage variations, isolating the bulk of P-type transistors from the power voltage to maintain stability and ensure fail-safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional input and output circuits are used without self-biasing mechanism, then the circuit structure is simpler, but the voltage levels become unstable during system failures causing collapse or electric leakage
Solution Approach 1:
The circuit employs self-biasing mechanisms where transistors automatically generate and regulate their own bias voltages through internal feedback loops. The bias voltage generation circuit uses the transistors themselves to create the necessary voltage levels without external intervention, enabling the circuit to self-regulate during normal operation and failure conditions.
Solution Approach 2:
The circuit incorporates feedback mechanisms where the bias voltage generation circuit continuously monitors the voltage levels and adjusts the bias voltages accordingly. During system failures, the feedback loops detect voltage deviations and automatically correct them by adjusting the bias voltages applied to the stacked transistors, maintaining stable operation.
2Stability of the object's composition
If bias voltage is directly coupled to power voltage, then the circuit operation is simpler, but voltage fluctuations cause unstable transistor operation
Solution Approach 1:
The circuit separates the bias voltage generation function from the main power supply circuitry. Dedicated bias voltage generation circuits are implemented for different voltage levels (first bias voltage and second bias voltage), allowing independent optimization and stabilization of each bias voltage without affecting the other, thus isolating transistor operation from power voltage fluctuations.
Solution Approach 2:
The patent introduces intermediate bias voltage generation circuits that act as mediators between the power supply and the stacked transistors. These intermediate circuits convert and regulate the power voltage into stable bias voltages, isolating the transistors from direct exposure to power voltage fluctuations and providing stable operating conditions.
Data Source
AI summary
An input output circuit and a self-biased circuit are provided. The self-biased circuit includes a tracking circuit, a biasing control circuit and first to fourth transistors. The tracking circuit receives a first power voltage, and generates a bias voltage according to variation of the first power voltage. The biasing control circuit generates a first control signal, a second control signal and a third control signal according to the first power voltage and a voltage on a pad. The first transistor is coupled to the pad and controlled by the first control signal. The second transistor is controlled by the second control signal to provide a bias voltage. The third transistor is coupled to the pad and controlled by the third control signal and generates a fourth control signal according to the voltage on the pad. The fourth transistor is controlled by the fourth control signal to generate the bias voltage.